diff options
| author | Liam Howlett <liam.howlett@oracle.com> | 2022-10-11 16:08:37 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-10-12 15:56:46 -0700 |
| commit | 28c5609fb236807910ca347ad3e26c4567998526 (patch) | |
| tree | 8265bb663ef3fdc17e55234275bda4cc30b3b170 /mm/mprotect.c | |
| parent | 7be1c1a3c7b13fb259bb5159662a7b83622013b8 (diff) | |
mm/mmap: preallocate maple nodes for brk vma expansion
If the brk VMA is the last vma in a maple node and meets the rare criteria
that it can be expanded, then preallocation is necessary to avoid a
potential fs_reclaim circular lock issue on low resources.
At the same time use the actual vma start address (unaligned) when calling
vma_adjust_trans_huge().
Link: https://lkml.kernel.org/r/20221011160624.1253454-1-Liam.Howlett@oracle.com
Fixes: 2e7ce7d354f2 (mm/mmap: change do_brk_flags() to expand existing VMA and add do_brk_munmap())
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Reported-by: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mprotect.c')
0 files changed, 0 insertions, 0 deletions